Saprolegnia is an aquatic fungus under the phylum Omycota It is familiar with the name as water mould.

Habitat: i) Usually it gross on decaying organic substance as a saprophytic plant in water.

ii) It also grows on dead insects, dead animals and plants as a saprophyte.

iii) Some species of this fungus can grow on fishes, eggs and other aquatic animals as parasites

Structure: i) Their bodies are filamentous and branched. These branches are called hyphae and the plant body including hyphae is called mycelium

ii) Hyphae lack in transverse partition layer. Reproductive organs may develop from the apical part of hyphae. Male reproductive organs arc called antheridia and female reproductive organs are called archegonia